[gpfsug-discuss] Question regarding quorum nodes

[Danny Lang]

Hi,

You should be able to remove a node from quorum and it should be fairly safe.

This is assuming you're on CCR.

You can find the type with:

mmlscluster

Thanks
Danny
________________________________
From: Ott Oopkaup <ott.oopkaup at ut.ee>
Sent: 07 September 2023 2:51 PM
To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org>; Tina Friedrich <tina.friedrich at it.ox.ac.uk>; Danny Lang <danny.lang at crick.ac.uk>
Cc: theteam at arc.ox.ac.uk <theteam at arc.ox.ac.uk>
Subject: Re: [gpfsug-discuss] Question regarding quorum nodes


External Sender: Use caution.


Hi
Do you have quorum loss already, or just trying to remove a node that is
currently offline. Over the years I have had little to no problems
removing quorum from a defunct node. Just make sure mmgetstate for the
node is down and it should be fine to remove, since it's already out of
the cluster.
Just make sure you don't induce quorum loss with the moves. I'd probably
add the node first after making sure the defunct node is completely down.

Best

Ott Oopkaup
University of Tartu, High Performance Computing Centre

On 9/7/23 16:45, Tina Friedrich wrote:
> Thanks - I know the command.
>
> Can I remove quorum functionality from a node that is down - that's
> really what I want to know, I think. Is that safe to do?
>
> Tina
>
> On 07/09/2023 14:39, Danny Lang wrote:
>> Hi Tina,
>>
>> The command you're looking for is:
>>
>>
>> *mmchnode*
>>
>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibm.com%2Fdocs%2Fen%2Fstorage-scale%2F4.2.0%3Ftopic%3Dcommands-mmchnode-command&data=05%7C01%7C%7Ccdb5b906ab3b4d93d75f08dbafa98ff2%7C4eed7807ebad415aa7a99170947f4eae%7C0%7C0%7C638296915030390070%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qS0JSTfvO01vihhdvIVXc2N4%2BwkXeCxINM%2F4yhd9s9A%3D&reserved=0<https://www.ibm.com/docs/en/storage-scale/4.2.0?topic=commands-mmchnode-command>
>> <https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibm.com%2Fdocs%2Fen%2Fstorage-scale%2F4.2.0%3Ftopic%3Dcommands-mmchnode-command&data=05%7C01%7C%7Ccdb5b906ab3b4d93d75f08dbafa98ff2%7C4eed7807ebad415aa7a99170947f4eae%7C0%7C0%7C638296915030390070%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qS0JSTfvO01vihhdvIVXc2N4%2BwkXeCxINM%2F4yhd9s9A%3D&reserved=0<https://www.ibm.com/docs/en/storage-scale/4.2.0?topic=commands-mmchnode-command>>
>>
>>
>> This will allow you to add quorum nodes and to remove.
>>
>> ------
>>
>> I would advise checking everything prior to running commands. 🙂
>>
>> Thanks
>> Danny
>>
>> ------------------------------------------------------------------------
>> *From:* gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org> on behalf
>> of Tina Friedrich <tina.friedrich at it.ox.ac.uk>
>> *Sent:* 07 September 2023 2:28 PM
>> *To:* gpfsug-discuss at gpfsug.org <gpfsug-discuss at gpfsug.org>
>> *Cc:* theteam at arc.ox.ac.uk <theteam at arc.ox.ac.uk>
>> *Subject:* [gpfsug-discuss] Question regarding quorum nodes
>>
>> External Sender: Use caution.
>>
>>
>> Hello All,
>>
>> I hope someone can answer this quickly!
>>
>> We have - it seems - just lost one of our NSDs.The other took over as it
>> should - but unfortunately, the protocol nodes (i.e. I have a number of
>> nodes which now have stale file handles. (The file system is accessible
>> on the remaining NSD server and a number of other clients.)
>>
>> Unfortunately, in the 'home' cluster - the one that ones the disks - I
>> only have, five servers; three of which are quorum nodes, and of course
>> the failed NSD server is one of them.
>>
>> The question is - can I add quorum nodes with one node down, and can I
>> remove quorum functionality from a failed node?
>>
>> Tina
>>
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>>
>> The Francis Crick Institute Limited is a registered charity in
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>
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